JP6073309B2 - Molten metal holding and casting box with dual casting nozzles - Google Patents

Description

  This application claims priority from US Provisional Application No. 61 / 501,235, filed June 26, 2011, which is hereby incorporated by reference in its entirety.

  The present invention relates to a molten metal casting and holding box having a pyramidal lower portion. Its lower portion has a bottom region that surrounds the dual nozzle assembly, which is a pair of stopper rods that control the flow of molten metal through the two nozzles in the dual nozzle assembly. At the same time, the external flow of the molten metal from the box to the two casting molds is independently controlled.

  In foundry equipment, molten metal is processed by various equipment, some of which are US Pat. Nos. 2,264,740 (Brown), 2333113 (Martin et al.), 3395840 (Gardner). , 3549061 (Piene), 3810833 (Mantey et al.), 3848072 (Dershem et al.), 4638980 (Beele), and 4957376 (Fishman et al.), US patent applications Publication 2010 / 0282784A1 (Pavia et al.) And UK Patent Application Publication GB 2229384A (Fishman et al.).

  In such foundry equipment, molten metal is often cast into a casting mold from a rectangular or other flat bottom holding box. Such holding boxes generally have a bottom region that surrounds only one nozzle that controls the external flow of the molten metal. The holding box into which the molten metal is cast is sometimes referred to as a ladles and usually has a single bottom spout controlled by a stopper rod extending vertically through the molten metal in the box. Having a substantially enclosed container. US 2010/0282784 A1 discloses the use of dual nozzles in a cage. Controlling the flow of molten metal from the ladle or box to the casting mold is critical to the success of casting the metal part. Also, maintaining the nozzle temperature to roughly correspond to that of the molten metal is an important aspect of an efficient casting process. Furthermore, maintaining a molten state of the liquid, metal is an important consideration, especially when an unexpected interruption occurs in the casting process that can last for a relatively long period of time.

US Pat. No. 2,264,740 U.S. Pat. No. 2,333,113 US Pat. No. 3,395,840 US Pat. No. 3,549,061 US Pat. No. 3,810,083 U.S. Pat. No. 3,848,072 US Pat. No. 4,638,980 US Pat. No. 4,953,761 US Patent Application Publication No. 2010 / 0282784A1 British Patent Application No. 2229384A

  In principle, the flow rate of the molten metal cast from a rectangular box is directly proportional to the square root of the height of the molten metal in the box. This height is usually referred to as the “head” parameter. The head parameter (H) directly dominates the flow rate (Q) for the box, both of which are correlated by the following relationship:

  Here, Q corresponds to the flow rate of the molten metal cast from the box, and H corresponds to the molten metal head in the box.

  The amount of molten metal cast at the flow rate (Q) of equation (1) is also determined by the volume of molten metal inside the box itself. This volume (equal to the result of L × W × H) is determined by the length (L) and width (W) dimensions of the box, which are constant. Furthermore, this volume also depends on the height or head parameter (H) of the molten metal in the box. Since the length and width dimensions of the box are constant, the volume (V) and flow rate (Q) of the molten metal in the box decrease as the head parameter (H) decreases. In fact, this relationship shows that a 75% reduction in the volume of molten metal contained in the rectangular box results in a 75% reduction in head parameters (H) and a reduction in flow rate (Q) of about 50%. Decide what is equivalent. When a dual nozzle is utilized in a molten metal holding and casting box with a pyramidal lower portion, it is desirable to provide a means for producing a flow rate (Q) that is less directly dependent on the head parameter (H). .

  It is desirable to provide the casting box with a means for providing a relatively constant flow of molten metal that exits the box through a pair of nozzles and is received by a pair of adjacent casting molds. Such a countermeasure allows the use of dual nozzles with small openings, thereby reducing the generation of slag that contributes to nozzle clogging. This constant flow also contributes to the casting of the metal part.

  The conventional casting box may have a problem of nozzle clogging caused by a decrease in nozzle temperature during a delay period when casting is not performed. These delay periods generally occur as an interruption of the molten metal casting between the box and the casting mold to regulate continuous casting. During these successive delay periods, the nozzle begins to cool, so the liquefied slag contained in the particular molten metal and the metal itself tend to harden on the inner surface of the casting nozzle, and eventually the nozzle eye. Causes clogging.

  A further clogging problem is that conventional casting nozzles may be made of a heat-resistant material and have a configuration that contacts both the steel shell and the reinforcement plate located around the nozzles of the casting box. Can happen. This contact causes the shell and reinforcement plate, both usually metal, to function as a heat sink that draws heat away from the casting nozzle, thereby reducing the temperature of the nozzle. Such heat sink problems can be compensated by providing a continuous flow of molten metal to the nozzle that offsets heat removal by the sink. However, if the molten metal casting is not continuous, such a nozzle configuration causes different temperatures along the nozzle, which exposes the nozzle to a cooling effect that contributes to clogging. There is.

  A casting box with a pyramid-shaped lower part shall be provided, this lower part shall have a dual nozzle that maintains a heat exchange relationship with the molten metal, thereby providing a constant temperature of the nozzle Is desirable. Such a configuration allows the casting nozzle to be maintained in the box at a temperature close to the molten metal, negating the cooling effect caused by external devices that can contribute to clogging problems.

  Two (or dual) bottom nozzle casting boxes can be used in a casting line in which two molds are filled with molten metal, side-by-side (in a vertical row) or next to each other. For example, two separate nozzles 20 as shown in FIG. 7 can be provided by fixed separate nozzle openings in the bottom of the pyramidal lower portion of the box. However, this is not preferred because the nozzles are separated by a fixed distance and the distance between the sprue cups of the casting line can vary. Also, the replacement of two individual nozzles is a difficult task as it takes a lot of time and accomplishes the nozzle change while the box is very hot. Hot molten metal is flushed out of the box prior to nozzle replacement, but it is generally not feasible to wait for the box to cool to ambient ambient room temperature.

  One object of the present invention is to hold a molten metal having a pyramidal lower portion and to replace one (single) dual (twin) nozzle (block) assembly in a casting box, the casting The object is to provide a line that can be adjusted and the distance between the sprue cups of two molds filled with molten metal flowing through two nozzles can be varied.

  Another object of the present invention is a single metal dual nozzle assembly that is interchangeable in a molten metal holding and casting box with a pyramidal lower portion, as compared to two separate nozzles. It is to provide something that is easily exchanged.

  Another object of the present invention is a molten metal holding and casting box having a pyramidal lower portion, with a dual casting nozzle formed from a single dual nozzle assembly that is replaceable, within the assembly. The spacing between a pair of nozzles can be varied based on the choice of nozzle casting having the same overall dimensions, and such molten metal retention and casting boxes can be used for two nozzles in the assembly. It is an object to provide a combination of two separate stopper rod positioning and control devices that independently control the flow from each.

  In one aspect, the present invention is a molten metal holding and casting box having an upper rectangular portion and a pyramidal lower portion. A single dual nozzle assembly is disposed in the bottom region of the lower portion.

  In another aspect, the present invention is a molten metal holding and casting box having a pyramidal lower portion, the lower portion having a single dual nozzle assembly, and two casting molds. It is used for the simultaneous casting of molten metal inside. The pyramidal lower portion provides a relatively constant flow of molten metal that is cast from the box through each of the two nozzles in a single dual nozzle assembly.

  In another aspect, the invention is a molten metal holding and casting box having an upper rectangular portion and a lower inverted pyramid portion, wherein a single dual nozzle assembly is enclosed with a pair of nozzles. Is. A single dual-nozzle assembly is disposed in the bottom region of the lower inverted pyramid and is composed of a thermally conductive material and is boxed over a period of casting and non-casting through a pair of nozzles. While being in thermal contact with the molten metal contained therein, contact with the inverted pyramid portion on the lower side is blocked. The pair of stopper rods fits with the pair of nozzles and controls the flow of molten metal cast through each of the pair of nozzles. Each of the pair of stopper rods, when the nozzle insertion end of the pair of stopper rods is inserted into the conical funnel-shaped inlet of the pair of nozzles, and the flow of the molten metal through the pair of nozzles stops, A portion of each conical funnel-shaped inlet of the nozzle can be configured to contact the molten metal in the box. A single dual-nozzle holding plate can be removably secured to the bottom of the box's pyramidal lower portion around the respective outlets of a pair of nozzles in a single dual-nozzle assembly.

  In another aspect, the present invention is a method of casting molten metal into a pair of molds from a molten metal holding and casting box having an upper rectangular portion and a lower pyramidal portion. The box has a single dual nozzle assembly located at the bottom of the lower pyramidal portion, and the single dual nozzle assembly has a pair of nozzles. A pair of molds are transported into a molten metal receiving relationship with the box, and a single dual nozzle assembly is at the same temperature as the molten metal in the box, and the molten metal is a single dual nozzle from the box. Casting through each of the pair of nozzles of the assembly, where 75% of the molten metal contained in the box is cast into the pair of molds with a decrease of less than 30% in the flow rate of the molten metal.

  In another aspect, the present invention provides for holding a molten metal having an upper rectangular portion and a lower pyramid portion for casting the molten metal into a pair of molds and an existing single in a casting box. A method of replacing a dual nozzle assembly. The existing single dual nozzle assembly is located at the bottom of the lower pyramidal portion and has a pair of nozzles spaced apart by a first distance from each other. The insulating material surrounds the existing single dual nozzle assembly and the single dual nozzle retaining plate holds the bottom of the existing single dual nozzle assembly in the box. By removing a pair of retaining connections from a pair of retaining posts that support a single dual nozzle assembly retaining plate on the bottom of the box, a single dual nozzle assembly retaining plate can be • Removed from the bottom of the assembly. The insulating material surrounding the sides of the existing single dual nozzle assembly is removed, releasing the existing single dual nozzle assembly from the box. A new single dual nozzle assembly is inserted at the bottom of the box. Such a new single dual-nozzle assembly has a pair of nozzles having the same overall dimensions as the existing single dual-nozzle assembly and spaced apart by a second distance from each other. The distance is different from the first distance of an existing single dual nozzle assembly. Insulation material is attached around the sides of the new single dual nozzle assembly, and the holding connector is inserted into a pair of holding posts to attach the single dual nozzle assembly holding plate to the new By supporting against a single dual nozzle assembly, a single dual nozzle assembly retaining plate is attached to the bottom of a new single dual nozzle assembly.

  These and other aspects of the invention are set out in this specification and the appended claims.

FIG. 4 is a simplified cross-sectional view of an example of a molten metal casting and holding box of the present invention, taken through line AA in FIG. 3, with a single dual nozzle installed in the lower pyramid-shaped portion of the box; The assembly is shown. FIG. 2 is a cross-sectional view of FIG. 1 including a single dual nozzle assembly removed from a molten metal casting and holding box. FIG. 3 is an upper perspective view of an example of a molten metal casting and holding box of the present invention, with a single casting dual nozzle assembly at the bottom in the pyramid lower section of the box. FIG. 4 is a lower perspective view of the molten metal casting and holding box shown in FIG. 3. FIG. 4 is a side view of a molten metal casting and holding box shown in FIG. 3. FIG. 4 is a bottom view of the molten metal casting and holding box shown in FIG. 3. It is a perspective view of a single nozzle. FIG. 6 is a perspective view of an example of a single dual nozzle holding plate used in the present invention for holding a single dual nozzle assembly in a molten metal casting and holding box of the present invention. FIG. 9 (a) is a perspective view of an example of a column used in the present invention for mounting the single dual nozzle holding plate shown in FIG. 8 at a position on the molten metal casting and holding box; FIG. 9B is an example of a connector used to hold the holding plate shown in FIG. 8 against the casting and holding box of molten metal when attached to the support shown in FIG. 9A. It is a perspective view. FIG. 10 (a) is an isometric view of an example of a single dual nozzle assembly used in an example of a molten metal casting and holding box having a pyramidal lower portion of the present invention. b) is a plan view of the single dual-nozzle assembly shown in FIG. 10 (a), and FIG. 10 (c) is a single dual-nozzle assembly passing through line CC in FIG. 10 (b). FIG. 10 (d) is a sectional elevation view of a single dual nozzle assembly through line DD in FIG. 10 (a). Casting and holding molten metal with a single bottom casting dual nozzle assembly of the present invention for use with two stopper rod positioning and control devices and having a pyramidal lower portion of the present invention It is a fragmentary sectional elevation view of a box.

  For the purpose of illustrating the invention, there are shown in the drawings forms which are presently preferred and can be understood, but the invention is not limited to the precise arrangements and instrumentalities shown.

  Referring to the drawings, where like numerals mean like elements, in the figure an example of a molten metal casting and holding box 10 with a single dual nozzle assembly 12 and a pyramidal lower portion. It is shown. Here, a single dual nozzle assembly 12 can be used in an automatic mold system found in foundries. A typical automated mold system includes a conventional conveyor line that transports a plurality of adjacent molds to a casting station, where the box 10 passes nozzles 12b and 12c in a single dual nozzle assembly. The two adjacent molds that are subjected to casting are filled with molten metal. Typically, when filling two molds simultaneously, a mold conveyor line advances the two molds in a row or side-by-side at a constant speed and proceeds at once. The molten metal holding and casting box 10 provides a source of molten metal used for casting in the mold.

  In the molten metal holding and casting box 10, at least one single dual nozzle assembly 12 is disposed in its pyramidal bottom region. The molten metal holding and casting box 10 can be positioned directly on a pair of casting molds 80, for example, as shown in FIG. If required for a particular arrangement, for example, a pair of truck assemblies such as disclosed in GB-A-2229384A are arranged perpendicular to the X and Y directions so that the molten metal is poured. The positions of the two nozzles can be adjusted with respect to the sprue cup 80a in the mold 80 to be peeled.

  The molten metal holding and casting box 10 includes an upper rectangular portion 10a and a lower pyramid portion 10b. The outer structure 14 includes at least a refractory material layer 16, which forms an inner rectangular and pyramidal volume holding molten metal. As in the prior art, the box 10 may have a box cover that extends across the upper portion of the rectangular portion 10a. Molten metal can be supplied to the box 10 through a closable opening in the box cover. Box 10 shall have a discharge port 92 formed in portion 10 for pouring molten metal from the box when the box is tilted, as disclosed, for example, in GB-A-2229384A. be able to.

  As in the prior art, the box 10 is optionally divided into a cast-in portion and a refill portion by a vertical baffle of refractory material, as further disclosed in, for example, GB 2229384A. can do.

  The box cover described above may have a single or a pair of independent openings, thereby forming a passage for inserting the two stopper rods 94 in the box 10. Those stopper rods and associated position adjustment and control devices are disclosed in US Pat. No. 4,953,761 or US Published Patent Application No. 2010 / 0282784A, both of which are hereby incorporated by reference in their entirety. The stopper rod 94 alone can be positioned by positioning (fitting) the stopper rod tip 94a on the inlets 12b 'and 12c' of the nozzles 12b and 12c, thereby preventing the flow of molten metal. Alternatively, it can be raised independently by an associated position adjustment and control device as described above to allow molten metal to flow through one or both nozzles.

  If necessary for a particular use, the molten metal holding and casting box 10 can include means for tilting itself, as disclosed, for example, in GB 2229384A, Thereby, unused molten metal can be removed from the box through the discharge port 92.

  A single dual nozzle assembly 12 is constructed of a thermally conductive material and extends upward within the box 10. Thereby, the upper peripheral inlet surfaces 12a and 12a ′ are always retained in the box 10 regardless of whether the stopper rod is engaged with one or both of the nozzles in the assembly 12. The contact state with the molten metal (M) is maintained. The single dual nozzle assembly 12 is preferably constructed of an alumina / silica material or other suitable low heat resistance refractory material, and the nozzle used therefor is a conical funnel shaped inlet 12b ′ and 12c ′ and cylindrical outlets 12b ″ and 12c ″ preferably have circular inner dimensions. This construction of the single dual nozzle assembly 12 results in its own constant contact with the molten metal within the box 10, particularly in the central region 12a 'of the assembly between the nozzles. This constant contact always maintains the heat exchange relationship between the two nozzles in the assembly 12 with the molten metal. Although clogging of the two nozzles can occur during any cooling condition that the nozzle may be exposed to, the above heat exchange relationship prevents such nozzle clogging.

  Also, the above-described configuration of the single dual nozzle assembly 12 includes the metal structure of the box 10 itself (as disclosed in GB 2229384A, the reinforcing plate used to support the casting nozzle and the outer shell. 14) eliminates the heat sink problem of extracting thermal energy from the casting nozzle. In the present invention, a single dual nozzle assembly 12 moves the dual nozzle assembly along insulation standoffs 70a on a dual nozzle assembly support plate 70 as described in detail below. Surrounded by a thermal insulation material 18 (shown in FIG. 1) that insulates the heat sink.

A single dual nozzle assembly 12 is shown, for example, in FIG. 11 as being mounted in a molten metal casting and holding box having a pyramidal lower portion. Details of an example of a single dual nozzle assembly 22 that can be used in the present invention are shown in FIGS. 10 (a) -10 (d). The single dual nozzle assembly 22 can also be used for a flat bottom launder as described in US 2010/0282784 A1. In FIG. 10 (a), the overall size of a particular single dual nozzle assembly 22 is between the sprue cups on a pair of molds where molten metal is poured through the nozzles in the single dual nozzle assembly. Selected based on maximum space. In FIG. 10 (a), the maximum space between the nozzle centers is defined as x ₁ between nozzles 24a and 24b formed by casting or the like in a single dual nozzle assembly. After using arranged to a single dual-nozzle assembly 22, as shown in FIG. 10 (a), FIG. 10 (b), as Nozurupea 24a 'and 24b' which is a distance x ₂ between the nozzle central portion Narrowly spaced nozzles are formed by casting or the like in a single dual nozzle assembly having the same overall dimensions as the single dual nozzle assembly shown in FIG. The distance between the smaller sprue cup centers is adjusted.

The nozzle assembly is formed of a refractory material, but is worn out by the flow of molten metal over the period of use and requires replacement. Typically, the replacement is done without allowing the cast box structure surrounding the nozzle assembly to cool, and therefore the replacement of the nozzle assembly is preferably done as quickly and efficiently as possible. In dual casting applications, a single dual nozzle assembly, such as dual nozzle assembly 12 or 22 of FIGS. 10 (a) -10 (d), fulfills this requirement. Also, the single dual nozzle assembly of the present invention is such that when the replaced dual nozzle assembly is originally formed by casting or the like, the distance between the openings of each nozzle in the dual nozzle assembly changes. Enable. As shown in FIG. 10 (b), for example, the distance x ₁ between the centers of which are cast in the first dual nozzle in assembly (shown in solid) Nozurupea 24a and 24b of the nozzle opening, - the first dual nozzle can vary the distance x ₂ between the second cast dual nozzle in assembly (shown in dashed lines) of the nozzle openings of Nozurupea 24a 'and 24b' centers with the overall dimensions similar to the assembly. Thereby, significant changes in the distance and associated position between each nozzle in a single dual nozzle assembly having similar overall dimensions can be achieved. By comparison, when using two single replacement nozzle assemblies, the distance between the center of the nozzle openings is between the two single replacement nozzle assemblies actually installed at the bottom of the hot casting box. It needs to be realized. The ability to vary the length between the centers of two separate nozzle openings is, for example, the length (or position) between adjacent mold sprue cups 80a in a dual cast automatic mold line, as shown in FIG. is connected with. That is, in a dual casting process utilizing a single molten metal holding and casting box with a pyramidal lower portion, if the relative position of adjacent sprue cups in the mold automatic line changes, then With the replacement of the nozzle assembly, the relative position of the dual nozzles also needs to change. The stopper rod position adjustment and stopper rod position adjustment mechanism of the control device 10 as disclosed in US 2010/0282784 A1 can be used to quickly adjust the stopper rod position of each device, Thereby, the position of the nozzles in a newly installed single dual nozzle assembly can be changed.

  FIG. 8 shows an example of a single dual nozzle holding plate 70 that can be used to provide support for a dual nozzle assembly mounted in a molten metal casting and holding box of the present invention. The holding strut 72 (FIG. 9 (a)) can be suitably connected to the bottom of the box 10 either directly or by an intermediate connecting offset bracket 72a. The annular offset 70a on the holding plate 70 is the length of the holding column 72 passing through the opening 70b in the holding plate, along with the openings 70c around the drains 12b '' and 12c '' of each nozzle, relative to the bottom of the box. Install it. For example, as shown in FIG. 9B, the connecting tool 74 is inserted into each opening 72 ′ of the holding column to fix the single dual nozzle holding plate in a predetermined position. To replace the dual nozzle assembly, the connector 74 is removed from the retaining post to release the plate, thereby providing a means for quickly removing the single dual nozzle assembly installed. After removing the insulation material 18, the installed single dual nozzle can be removed from the box 10 and replaced with a new single dual nozzle assembly with new insulation material wrapped around it, Then, the single dual nozzle holding plate is attached again. Thereby, in the present invention, since a single dual nozzle assembly 12 is substantially surrounded by the insulating material 18 and the insulating annular offset 70a on the single dual nozzle assembly, the prior art heat sink The problem is substantially eliminated. This configuration effectively eliminates the clogging problem previously described, coupled with the fact that the dual nozzle regions 12a and 12a 'are always in contact with the molten metal in the box.

As shown, the box 10 includes an upper rectangular portion 10a and a lower inverted pyramid portion 10b surrounding a single dual nozzle assembly 12 at its bottom region. Rectangular portion 10a of the upper side may be assumed to include the volume V ₁ of the molten metal, which can be expressed as follows.

  Here, W and L represent the dimensions of the width and length of the box 10, respectively, and H represents the dimension of the head (H).

Inverted pyramid-shaped portion 10b of the lower side may be assumed to include the volume V ₂ of the molten metal, which can be expressed as follows.

The total volume V _T of box 10 can be expressed as follows when filled with molten metal:

The shape of the box 10, in particular the pyramidal portion 10 b, is a relatively constant flow (Q) of molten metal (as previously described in equation (1)) from each nozzle in the dual nozzle assembly to the casting mold. This is advantageous. As previously mentioned, a relatively constant flow rate (Q) is not only advantageous for the mold casting process itself, but also has a small opening that eases the burden of accurately controlling the outflow of molten metal from the box 10. It is possible to use a nozzle having the same. In particular, the pyramid-shaped portion 10b realizes a casting form that makes it possible to use about 75% of the volume (V _T ) of the molten metal contained in the box 10, thereby allowing a dual nozzle to form a pair of casting molds. In addition, it is poured with a drop corresponding to only 50% of the pressure head (H) and with a drop of about 30% of the flow rate (Q). The flow rate (Q) and pressure head parameter (H) provided by the present invention extrude molten metal through each dual casting nozzle in a relatively constant manner.

  In some examples of this invention, a pair of nozzles within a single dual nozzle assembly need not be the same size.

For example, as disclosed in U.S. Pat. No. 4,744,407, it is determined when the molten metal has reached the required level in each of two sprue cups filled from an open nozzle within a single dual nozzle assembly. in order to install the image device to, the outside of the holding and pouring box 10 of the molten metal as shown in FIG. 4 can be provided a recess 10c.

  The invention has been described in terms of preferred examples and embodiments. In addition to these explicit descriptions, equivalents, alternatives, and improvements are possible within the scope of the invention.

Claims (7)

A molten metal holding and casting box for holding a predetermined amount of molten metal;
The upper rectangular portion for receiving the predetermined amount of molten metal through a closeable opening in the upper rectangular portion of the molten metal holding and casting box ;
An inverted pyramid-like part on the lower side,
A single dual nozzle assembly having a pair of nozzles housed within a bottom region of the lower inverted pyramid portion , the single dual nozzle assembly being constructed of a thermally conductive material. In addition, the molten metal is thermally shielded from contact with the lower inverted pyramid-shaped portion and is held in the casting box and melted in the casting box over a period of casting and not casting through the pair of nozzles. In thermal contact with the metal, the pair of nozzles are controlled by a pair of stopper rods that engage the pair of nozzles for the flow of molten metal that is poured through each of the pair of nozzles. The upper rectangular portion has a rectangular shape in a cross section perpendicular to the direction of the flow of the molten metal passing through the pair of nozzles. Due to the fact that 75% of the amount of the molten metal contained in the molten metal holding and casting box is cast through the pair of nozzles, the flow rate of the molten metal is reduced by less than 30%. A molten metal holding and casting box comprising a dual nozzle assembly . Holding and pouring box of the molten metal further comprises an outer structure support layer, and at least one inner heat-insulating material layer for maintaining the temperature of the molten metal holding and pouring box in the molten metal, according to claim 1 A molten metal holding and casting box according to claim 1. The molten metal holding and casting box of claim 1 or 2 , wherein the single dual nozzle assembly is comprised of a material selected from the group consisting of alumina and silica. Each of the pair of nozzles has a conical funnel-shaped inlet, and each nozzle insertion end of the pair of stopper rods is inserted into the conical funnel-shaped inlet of the pair of nozzles, When the flow of molten metal through the pair of nozzles is stopped, a part of the conical funnel-shaped inlet in each of the pair of nozzles contacts the molten metal holding and the molten metal in the casting box. The holding | maintenance of a molten metal and casting box as described in any one of Claims 1-3 with which each nozzle insertion edge part of a pair of said stopper rod is comprised. Around the outlet of each of the pair of nozzles in the single dual nozzle assembly is removably secured to the molten metal holding and bottom region of the lower inverted pyramid portion of the casting box. and a single dual nozzle holding plate
A pair of holding struts secured to the bottom region of the lower inverted pyramid-shaped portion;
A holding connection that passes through each of the pair of holding posts at the bottom of the single dual nozzle holding plate;
Thermal insulation material surrounding the periphery of the single dual nozzle assembly, and each of the pair of nozzles that thermally isolates the single dual nozzle assembly from contact with the lower inverted pyramid portion. A combination of insulated standoffs mounted around the outlet, wherein the insulated standoffs are disposed between the bottom of a single nozzle assembly and the top of the single dual nozzle holding plate. The molten metal holding and casting box according to any one of claims 1 to 4 , further comprising a combination . A predetermined amount of molten metal in the molten metal holding and pouring box, a method of casting molten metal into the one or more pairs of molds, holding and casting boxes of the molten metal, rectangular portion of the upper and it has a pyramidal portion of the lower side, holding and casting boxes of the molten metal, a single dual nozzle housed in the bottom of the pyramid-shaped portion of the lower side while being constituted by a thermally conductive material, have a assembly, thereby, the single dual nozzle assemblies, which are thermally isolated from contact with the inverted pyramid-shaped portion of the lower side, wherein the single dual nozzle assembly, have a pair of nozzles, the rectangular portion of the upper side is intended to have a rectangular shape in cross section perpendicular to the direction of molten metal flow through the pair of nozzle, the method comprising:
Casting the predetermined amount of molten metal through a closable opening in the upper rectangular portion;
Carry one of said one or more pairs of molds, the receiving relationship of molten metal between the holding and pouring box of the molten metal,
By always contacting the single dual nozzle assembly with the molten metal, the single dual nozzle assembly is held at the same temperature as the molten metal holding and the predetermined amount of molten metal in the pouring box. Holding and casting the molten metal from the molten metal holding and casting box through each of the pair of nozzles of the single dual nozzle assembly, thereby holding the molten metal and when 75% of the amount of the molten metal contained in the casting box is cast, comprising that said flow of molten metal is less than the low below 30%, method. Holding a molten metal having an upper rectangular portion and a lower pyramid portion for casting molten metal into a first pair of molds and replacing an existing single dual nozzle assembly in a casting box A method for holding a molten metal and a casting box for holding a predetermined amount of molten metal , wherein the first pair of molds have sprue cups separated by a first distance, The upper rectangular portion has a rectangular shape in a cross section orthogonal to the direction of the flow of the molten metal passing through the pair of nozzles, whereby the molten metal contained in the molten metal holding and casting box 75% of the amount of, when cast through the pair of nozzle, the reduced flow rate is less than 30% of the molten metal, the existing single dual nozzle assembly, prior to Housed in the bottom of the pyramid-shaped portion of the lower side Rutotomoni, those having a pair of nozzles spaced apart in a first nozzle distance from each other, insulation material, the existing single dual nozzle assembly And a single dual nozzle holding plate holds the bottom of the existing single dual nozzle assembly of the molten metal holding and casting box, the method comprising:
The single dual nozzle assembly holding plate is removed from the pair of holding posts that support the molten metal holding and casting box at the bottom of the casting box, thereby removing the single dual nozzle assembly holding plate. Removing from the bottom of the existing single dual nozzle assembly;
Removing the insulating material surrounding the sides of the existing single dual nozzle assembly and releasing the existing single dual nozzle assembly from the molten metal holding and casting box;
Inserting a new single dual nozzle assembly into the bottom of the molten metal holding and casting box, wherein the new single dual nozzle assembly is the existing single dual nozzle; assembly has the same overall dimensions and, the new single dual nozzle assembly has a pair of new nozzles spaced apart in a second nozzle distance from each other, the second nozzle distance There Unlike the first nozzle distance, whereby the step of adjusting the second pair of mold having a sprue cup spaced apart by a second distance,
Attaching the thermal insulation material around the sides of the new single dual nozzle assembly; and
Inserting the pair of holding connectors into the pair of holding posts and supporting the single dual nozzle assembly holding plate against the bottom of the new single dual nozzle assembly; Attaching a single dual nozzle assembly retaining plate to the bottom of the new single dual nozzle assembly.

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